Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery

A fluorosilicate and phosphate technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve environmental risks and other issues

Active Publication Date: 2014-05-21
OSTARA NUTRIENT RECOVERY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ponds containing large amounts of phosphogypsum pool water present a significant risk to the environment

Method used

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  • Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery
  • Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery
  • Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery

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Embodiment Construction

[0022] Throughout the following description, specific details are set forth in order to provide a more thorough understanding of the present invention. However, the present invention can be practiced without these particularities. In other instances, well known parts have not been shown or described in detail to avoid unnecessarily obscuring the invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

[0023] figure 1 A wastewater treatment process 1 according to a non-limiting example embodiment of the present invention is illustrated in a general manner. In Process 1, phosphate-containing wastewater from a wastewater source is sequentially subjected to a fluorosilicate recovery step 10, a fluoride removal step 20, a residual cation removal step 30, a residual silica removal step 40, and a phosphate recovery step 50 . The wastewater can then optionally be subjected to a post-treatment step 60 to obtain a treated e...

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Abstract

A method for treating phosphate-containing wastewater, such as phosphogypsum pond water. The method includes the steps of: (a) adding a first cation to the wastewater to precipitate fluorosilicate from the wastewater; (b) adding a second cation to the wastewater to precipitate fluoride from the wastewater; (c) raising the pH of the wastewater to precipitate the second cation from the wastewater; (d) removing residual silica from the wastewater; and (e) precipitating phosphate from the wastewater. The precipitated fluorosilicate may be sodium fluorosilicate. The precipitated phosphate may be struvite.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Application No. 61 / 537,496, filed September 21, 2011, entitled: Treatment of Phosphate-Containing Wastewater and Recovery of Fluorosilicates and Phosphates, and the title filed on November 21, 2011 Priority of US Application No. 61 / 562,388 for: Treatment of Phosphate-Containing Wastewater and Recovery of Fluorosilicates and Phosphates. For purposes in the United States, this application claims the benefit under 35 U.S.C. §119 of U.S. Application No. filed on September 21, 2011 entitled: Treatment of Phosphate-Containing Wastewater and Recovery of Fluorosilicate and Phosphate 61 / 537,496 and US Application No. 61 / 562,388, filed November 21, 2011, which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to the treatment of phosphate-containing wastewater, such as phosphogypsum pond water, and also to the recovery of useful fluorosilicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01B25/45C02F1/44C02F1/66
CPCC02F1/66C02F1/5236C02F2101/10C02F2101/14C01B25/32C01B33/20C02F1/58C02F1/583C02F1/60C02F9/00C02F2001/5218
Inventor P·科特A·布里顿R·P·M·塞斯亚纳拉亚纳R·M·西斯罗普D·R·克拉克
Owner OSTARA NUTRIENT RECOVERY TECH INC
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